Learn how to create android applications / modifications, any recommendations?
A short time ago I bought tecnology android
and I've realized that I love to make changes, delete, re-program, install Rom, etc..
I always liked this programming, the only limitation I had was my financial situation, but it does not allow a limitation, short steps going forward.
For this reason I come to ask those who already know how to program, where I can find good tutorials, PDF materials, sources serve me to learn programming this wonder?
I would also like you to tell me how hard it can be. I already I have some knowledge of codes, mainly web design, HTML, CSS and some PHP.
Since today I get to work
PD: Translated by Google